0191 5166636 enquiries@ht-uk.com

The EHG® SL10 is a key component in a powerful system heating element control that integrates a heater, an adjustable set point temperature controller, high/low temperature alert, power switching device and a high temperature safety limit. This agency recognized controller/safety limit meets UL® 1998 and CE 60730 requirements. The optional display/communications module can be easily upgraded and added in the field to provide digital display indication, adjustment of set point, RS485 Modbus® communications and other human machine interface (HMI) features. This system allows you to purchase only what is needed for your application.

The easy to install, compact design, inherent reliability and integrated limit functions make this heating element controller a tremendous value. The controller is designed for easy integration with Watlow® heaters simplifying engineering, reducing component count on new equipment and decreasing cost of ownership. For original equipment manufacturers (OEMs), CE, Semi-S2 compliance and UL® recognition will reduce time and costs necessary for global agency testing and validation.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
N/A  158 70 80 12.5
  • Controllers are integral to the heater and are supplied by Watlow
  • Ambient operating temperature range of 32 to 158°F (0 to 70°C)
  • Safety limit alarm - 10A relay
  • Two, Type K thermocouple inputs - process temperature control and safety limit
  • Process temperature output - 10A NO-ARC relay


  • Warming and serving foodservice equipment
  • Food holding cabinets
  • Life sciences laboratory equipment
  • Life sciences medical equipment
  • Hot sealing bars
  • Hot glue equipment
  • Gas delivery lines

Features & Benefits:

Features Benefits
Process controller and safety limit in one package
  • Meets UL® 1998 and CE 60730 requirements
  • Eliminates the need for a thermal fuse on a heater
  • Eliminates replacement of heater when fuse fails
Optional display/communications module
  • Allows easy upgrade on to base device
  • Offers low cost field upgrade
  • Provides easy, snap-on installation
Accurate and flexible temperature process controller
  • Replaces problematic bi-metal thermostats with accurate electronic temperature process controller
  • Allows easy change of process parameters
Ambient operating temperature range 32 to 158°F (0 to 70°C)
  • Increases reliability when mounting in harsh temperature environments or in close proximity to heaters
Integrated high/low temperature alert signal relay
  • Provides dry contact output to activate external alarm or process function
  • Signals control status with three integrated LEDs
  • Allows a signal of up to two amperes 30VAC/VDC, Form A to alert if process temperature is out of range limits
Health check diagnostics
  • Monitors maximum heater process temperature, maximum ambient temperature and thermocouple operation
  • Provides health check signal to inform operator that the process is working correctly
Universal power supply
  • Allows an input of 85 to 264VAC, 50/60Hz
  • Provides safe control of up to 2400 watts with 10 amperes switching in both controller and safety limit
Can be switched from on-off and PID algorithm
  • Increases product life (on-off control is default)
  • Offers selectable PID control algorithm for tighter temperature uniformity
Universal 1/8 turn mounting bracket
  • Allows mounting to most surfaces
  • Provides flexible mounting - either horizontally or vertically